August in Hoorn averages a daily high of 22°C with nights around 12.9°C. Expect roughly 13.6 wet days totalling 95.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hoorn is June–September.
Based on BERKHOUT, NL (5.5km), 1995–2024. 26 years of August data.